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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db092aca3b11fecd5344ddb4b626f062c6d2253e2cfc4de43874f8b8b3fa6cf1' 
  AND token = 'DAQPh4AAH4slfraGBSxlmJOtOfFC8L9FaUys45NCMO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}